40405554 has 112 divisors (see below), whose sum is σ = 107656128. Its totient is φ = 11127456.

The previous prime is 40405543. The next prime is 40405559. The reversal of 40405554 is 45550404.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40405559) by changing a digit.

It is a polite number, since it can be written in 55 ways as a sum of consecutive naturals, for example, 377569 + ... + 377675.

Almost surely, 2^40405554 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 40405554, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (53828064).

40405554 is an abundant number, since it is smaller than the sum of its proper divisors (67250574).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

40405554 is a wasteful number, since it uses less digits than its factorization.

40405554 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 171 (or 156 counting only the distinct ones).

The product of its (nonzero) digits is 8000, while the sum is 27.

The square root of 40405554 is about 6356.5363209849. The cubic root of 40405554 is about 343.1471176283.

Adding to 40405554 its reverse (45550404), we get a palindrome (85955958).

The spelling of 40405554 in words is "forty million, four hundred five thousand, five hundred fifty-four".